Solve for a
a=\frac{-x-7}{4}
Solve for x
x=-4a-7
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4a=-7-x
Subtract x from both sides.
4a=-x-7
The equation is in standard form.
\frac{4a}{4}=\frac{-x-7}{4}
Divide both sides by 4.
a=\frac{-x-7}{4}
Dividing by 4 undoes the multiplication by 4.
x=-7-4a
Subtract 4a from both sides.
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